Fluid tank



FIG. 1 is a top isometric view of a fluid tank embodying my new design;

FIG. 2 is a bottom isometric view thereof;

FIG. 3 is a front elevation view thereof;

FIG. 4 is a rear elevation view thereof;

FIG. 5 is a left side elevation view thereof;

FIG. 6 is a right side elevation view thereof;

FIG. 7 is a top plan view thereof; and,

FIG. 8 is a bottom plan view thereof.

Stippling in the drawings represent the three-dimensional contours of the design, and is not intended to indicate surface decoration. The broken lines shown in the drawings depict portions of the fluid tank that form no part of the claimed design. 

CLAIM The ornamental design for a fluid tank, as shown and described. 